Mine didn’t either; I think the majority don’t.
The issue isn’t shaveh p’rutah, it’s s’michas daas. IOW, if the marked karatage is wrong, there could be an issue. She may assume, for instance, that the ring is worth $150, and only be meksbeles kiddushin on that assumption, yet the ring is only worth $18, so the kiddushin would be invalid.